XElement和List< T> [英] XElement and List<T>

问题描述

我有一个具有以下属性的类:

I have a class that has the following properties:

public class Author {
  public string FirstName { get; set; }
  public string LastName { get; set; }
}

接下来，我有一个类似的作者列表:

Next, I have a List of Authors like so:

List<Author> authors = new List<Author> ();

authors.add(
  new Author { 
    FirstName = "Steven",
    LastName = "King"
  });

authors.add(
  new Author { 
    FirstName = "Homer",
    LastName = ""
  });

现在，我正在尝试使用Linq到XML，以便生成代表我的作者列表的XML.

Now, I am trying to use Linq to XML in order to generate the XML representing my Authors List.

new XElement("Authors",
  new XElement("Author", 
    from na in this.Authors
    select new XElement("First", na.First)))

上面的块没有生成XML，正如我期望的那样.我得到的是:

The block above does not generate the XML as I expect it to. What I get is:

<Authors>
  <Author>
    <First>Steven</First>
    <First>Homer</First>
  </Author>
<Authors>

我希望XML输出看起来是这样的:

What I want the XML output to look like is:

<Authors>
  <Author>
    <First>Steven</First>
    <Last>King</Last>
  </Author>
  <Author>
    <First>Homer</First>
    <Last></Last>
  </Author>
</Authors>

我们将非常感谢您提供有关如何使XML看起来像我需要的任何帮助！

Any help on how to get the XML to look as I need it to would be immensely appreciated!

推荐答案

您需要传递

You need to pass the IEnumerable<XElement> query as the second parameter, not the "Author" string, like so:

// Note the new way to initialize collections in C# 3.0.
List<Author> authors = new List<Author> ()
{
  new Author { FirstName = "Steven", LastName = "King" }),
  new Author { FirstName = "Homer", LastName = "" })
};

// The XML
XElement xml = new XElement("Authors",
    from na in this.Authors
    select new XElement("Author",
        new XElement("First", na.FirstName),
        new XElement("Last", na.LastName)));

这将为您提供所需的结果.

That will give you the result you need.

这篇关于XElement和List< T>的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！